Koy is a distinctive boys' name in United States, ranking #2623 in 2004 with 41 recorded births. The name reached its all-time peak in 1997 with 46 births ranking #1982. Since 1996, the popularity has increased by 95.2%. In 2004, approximately 1 in every 48,410 boys born was named Koy. FALLING Recent data shows the name is currently falling.